Part of what makes or breaks an SCP is what information you make available and what information you hold back.

In this case, much of the information seems trivial or extraneous. For example, mentioning that this SCP has "significantly above average intelligence" or "plays video games". It just doesn't add any impact to know these things.

Moving on, referring to the SCP as an object when it's a person, and then in the same breath describing how this SCP spends its personal time, that just doesn't work. Either the tone is harsh and impersonal, or the tone is conversational. It can't be both at the same time. I'd advise changing "object" to "subject".

On the other side of it, you didn't give enough information on what the disease actually does to those it infects for the "[DATA EXPUNGED]" to have any kick to it. As it is right now, it's basically just a generic "okay so there's this disease and it kills people, and the ones it doesn't kill wanna die". Other than the "a person who is immune to it occasionally generates the disease" gimmick, it really doesn't have much individuality to it. Reading through it, I'm compelled to ask "And?"

Additionally, if he was generating this terrible disease and it was killing personnel left and right, why wouldn't they just shoot him in the head and then incinerate him, especially given that incineration has proven effective in eliminating the disease from corpses? The article would make far more sense if there were some reason he couldn't simply be killed to eliminate the threat.

Now, on to what I liked.

The containment procedures are straightforward and completely rational given what this SCP does.

The core concept has potential, and given some polishing it could be really, truly scary. I'd suggest playing up the psychological aspect of being powerless to stop yourself from killing people via those seizures, or going into more detail about why the surviving infected absolutely always request termination.